@n_matias the Board ID, aka Forum ID is a unique key created when you set up the initial board/forum its a hidden key you can find this if you go to Community Structure, then go to the board and click Manage, the url should end in forum-board:myforum. To create filters you can use your text editor to find specific code words needed such as "board.id.title = Forum ID", you can use "config.filter_report_board_id.title = Board ID for filter reports".
Let me know if this answers your question!
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